If you don't think turbochargers rob horsepower, disconnect the intake side and run the engine, normally aspirated, with the turbo still mounted to the exhaust!! I've done it!! It really kills some engines' performance. Further, apply restriction equal to manifold pressure to the open system!!
Turbocharged horsepower is NOT something for nothing!! Turbocharging has it's own peculiarities and drawbacks.
I'm a fan of both!!
A side note: Most production automobile engines don't have enough power to drive the supercharger on a top fuel engine!!!
A second side note: Most production engines won't make enough exhaust thrust to drive a high output turbo like the ones seen on top sportsman race cars!!
